A year ago, workers at a Starbucks store in Buffalo, New York, voted to unionize, a first for the chain.
In the past year, more than 260 Starbucks stores have voted in favor of unionizing, giving the union a win rate of 80%, according to data from the National Labor Relations Board.
In April, as the union movement continued to gain steam, Starbucks CEO Kevin Johnson announced he would retire.
Starbucks has also fired organizers for unrelated infractions, closed a handful of union stores and withheld higher pay and enhanced benefits from baristas at unionized locations.
Cathy Creighton, director of Cornell University's Industrial and Labor Relations branch in Buffalo, said that companies often use delay tactics to frustrate unions and take away momentum.